Automobile-alarm.



R. C. GROH.

AUTOMOBlLE ALARM.

APPLICATION FILED OCT. 3. i912.

Patentd Aug. 21, 1915.

2 SHEETS-SHEET 2- WsTNEssEs lNvENToR 1 ornqys ROBERT C. -GROH, OF ST; PAUL, MINNESQTA, .ASSIGNQE, BY DIEEGT ANB ASSIGNMENTS, OF THBEE-EIGHTHS TO TEOMAS 1?. PAUL GOTTFRIED, AND ONE-FOURTH Ti) MINNESOTA."

I little? rassnn arenas, sienna-arouses no can ant. or so. rant,

AUTGMGBILEALARM.

Specification of Letters iatent.

Patented Aug. 24.,

Application filed October 3, 1912. {serial Ito. 723532 To all whom it may concern:

Be it known that l. Bonner C. Goon, a citizen of the United States, residing at St. Paul, in the county of Ramsey and State of Minnesota, have invented certain new and useful Improvements in Automobile-Alarms, of which the following is a specification.

My invention relates to improvements in thief alarms for automobiles, its object being particularly to provide an improved form of thief alarm actuatedby the battery or magneto current of an automobile to 'ing an alarm when the current is turned on.

To this end theinvention consists in the features of construction, combination, and arrangement of parts hereinafter dBSC ll)(l and claimed.

In the-accompanying drawings forming part of this specification, Figure 1 is a side view, broken away, of an automobile showing my alarm box fastened upon the dashboard, with the door of the box open; Fi 2 is a diagrammatic view of the wiring of an automobile illustrating one method or insorting my, invention therein; Fig. 3 is a similar view of the wiring illustrating a modified method of inserting my invention therein; Fi 4 is avertical transverse section through the alarm box; Fig. 5 is a section on line m-;v of Fig. 4:; and 6 is a detail view of a portion showing a modified construction of switch.

Referring to the drawings, A represents an automobile, B the engine cylinders, G the batteries, D the magneto, E the induction coil box, and F the ordinary switch for turning on the battery or magneto current.

Adapted to be fastened upon the dashboard, as shown in Fig. 1, is the alarm containing box G. Mounted within the box is a bell 2 in connection with which is arranged a hammer 3 supported by an armature 4: having pivotal support 5, and adapted to be actuated in the ordinary manner by electromagnets 6 against the tension of the arrnature controlling spring 7. Conducting wires 8 and 9 lead into the box through an opening 10,-the wire 8 leading directly to the armature frame and the wire 9 leading to a contact 11 forming partof the alarm switch. The contact 11 is supported upon a plate 12- which also supports an independent contact 13 connected by a conducting wire 1.4: with the electromagnet frame. The contacts 11 of the alarm box andlii adapted to be electrically connected by a slidable bolt 15 forming part of theloclr 1t and adapted to be thrown into position connecting said contacts 11 andl3 by thelrey actuation of said lock.

In the arrangement illustrated in Fg. 2 1 show the wire 8 leading from the pri ary wire 17 and the wire 9 of the alarin leading to the ground or return wire 18 or" the wiring system of the car. In the arrange ment shown in Fig. 2 it will be evident that when the bolt 15 is actuated to connect the contacts 11 and 13 and with the battery or magneto current turned on, the current will pass through the electromagnet 6 and actuate the bell to sound an alarm.

in Figs. and 6 isshown an arrangement ot wiring in which the magneto or battery current when turned on will pass through a portion oithe alarm mechanism. without sounding an alarm unless the alarm control is switched into circuit. As shown in this arrangement the alarm apparatus is tapped into the wire 19 leading from the coil box to the spark plug. With this'arrangement I utilize the modified form of alarm controlling switch shown in Fig: 6. Referring to Fig. 6, 20 and 21 represent two opposed contacts, the contact 20 being connected with. the alarm apparatus by conducting wire 22 corresponding with the wire 14 shown in Fig. 4:. Arranged below the contacts 20 and 21 are similar contacts 23 and 24:- The contact 23 is connectedby an outlet wire 25 with the secondary circuit wire 19 and also connected with the alarm apparatiuv through thewire 26. electrically connected by a connection 27, an inlet wire 28 leading from the secondary current wire 19 to the contact 2%. The

switch bar 29 corresponds with the bolt 15 in the construction shown in Fig. 4.- and normally stands electrically connecting the contests 23 and 2%. When it is desired to actuate an alarm the switch bar will be moved into position connecting the contacts 20 and 21.. \Vith the switch bar in the pos tior; shown in Fig. 6 the secondary current pass ing through the wire 19 will pass through the wire 28, the contacts 24 and 23, the switch par 9.9, and out through the wire 25 iVhen the switch bar is moved into coF-pera tion with the contacts 20 and 21. the current will pass through the wire 28, the contacu The contacts 21 and 24 are of an automobile, an alarm bell, cooperating electr'omagnets, electric wiring for said magnets, separated electric contacts interposed between said alarm wiring and main wiring,

a key actuated plunger operable to close said contacts forthe purpose set forth, said planger being in circuit with the electric wiring of the automobile when in circuit with the alarm apparatus, and also when out of ,cir-

cuit with the alarm apparatus.

In testimony whereof I aifix my signature in presence of two witnesses.

ROBERT C. GROH.

Witnesses:

H. SWANsoN, H. S. JOHNSON. 

